package com.chb.test.AvgTemperature;

import java.io.IOException;

import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

public class MyAvgMapper extends Mapper<LongWritable, Text, Text, Text>{
	private static final  int  MISSING = 9999;
	@Override
	protected void map(LongWritable key, Text value, Context context)
			throws IOException, InterruptedException {
		String line = value.toString();
		String year = line.substring(15, 19);
		int airTemperature;
		if(line.charAt(87) == '+') {
			airTemperature = Integer.parseInt(line.substring(88, 92));
		}else {
			airTemperature = Integer.parseInt(line.substring(87,92));
		}
		String quality = line.substring( 92, 93);
		if (airTemperature != MISSING && quality.matches("[01459]")) {
			context.write(new Text(year), new Text(String.valueOf(airTemperature)));
		}
	}
}
